Security alarm



FIG. 1 is a perspective view of a security alarm of the present invention, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view of the security alarm of FIG. 1;

FIG. 3 is a rear plan view of the security alarm of FIG. 1;

FIG. 4 is a front elevational view of the security alarm of FIG. 1;

FIG. 5 is a right side elevational view of the security alarm of FIG. 1, the left side view being a mirror image thereof; and,

FIG. 6 is a bottom plan view of the security alarm of FIG. 1. 

The ornamental design for a security alarm, as shown and described. 